From acc1be1a0c210d160b4600783c6d98ce2755df66 Mon Sep 17 00:00:00 2001
From: X <i@jex.me>
Date: Sun, 29 Jan 2023 01:41:06 +0800
Subject: [PATCH] Fix fake module export names resolving (close #510)

---
 server/esm.go                             | 15 +++++++++++++--
 test/react-18-stream/deno.json            |  8 ++++++++
 test/react-18-stream/react-steam.test.tsx | 18 ++++++++++++++++++
 3 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 test/react-18-stream/deno.json
 create mode 100644 test/react-18-stream/react-steam.test.tsx

diff --git a/server/esm.go b/server/esm.go
index a92225d49..faa7d74ad 100644
--- a/server/esm.go
+++ b/server/esm.go
@@ -173,8 +173,20 @@ func initModule(wd string, pkg Pkg, target string, isDev bool) (esm *ESM, npm Np
 			return
 		}
 
-		log.Warnf("fake ES module '%s' of '%s', use the `main` field instead", npm.Module, npm.Name)
+		var ret cjsExportsResult
+		ret, err = parseCJSModuleExports(wd, path.Join(wd, "node_modules", pkg.Name, modulePath), nodeEnv)
+		if err == nil && ret.Error != "" {
+			err = fmt.Errorf("parseCJSModuleExports: %s", ret.Error)
+		}
+		if err != nil {
+			return
+		}
+		npm.Main = npm.Module
 		npm.Module = ""
+		esm.ExportDefault = ret.ExportDefault
+		esm.Exports = ret.Exports
+		log.Warnf("fake ES module '%s' of '%s'", npm.Main, npm.Name)
+		return
 	}
 
 	if npm.Main != "" {
@@ -189,7 +201,6 @@ func initModule(wd string, pkg Pkg, target string, isDev bool) (esm *ESM, npm Np
 		esm.ExportDefault = ret.ExportDefault
 		esm.Exports = ret.Exports
 	}
-
 	return
 }
 
diff --git a/test/react-18-stream/deno.json b/test/react-18-stream/deno.json
new file mode 100644
index 000000000..72517779f
--- /dev/null
+++ b/test/react-18-stream/deno.json
@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "lib": [
+      "dom",
+      "deno.ns" 
+    ]
+  }
+}
\ No newline at end of file
diff --git a/test/react-18-stream/react-steam.test.tsx b/test/react-18-stream/react-steam.test.tsx
new file mode 100644
index 000000000..a8dcf3c36
--- /dev/null
+++ b/test/react-18-stream/react-steam.test.tsx
@@ -0,0 +1,18 @@
+import { assertStringIncludes } from "https://deno.land/std@0.170.0/testing/asserts.ts";
+
+import React from "http://localhost:8080/react@18";
+import { renderToReadableStream } from "http://localhost:8080/react-dom@18/server";
+
+Deno.test("react-18-stream", async () => {
+  const res = new Response(
+    await renderToReadableStream(
+      <main>
+        <h1>Hi :)</h1>
+      </main>,
+    ),
+  );
+  const html = await res.text();
+  assertStringIncludes(html, "<main");
+  assertStringIncludes(html, "<h1>Hi :)</h1>");
+  assertStringIncludes(html, "</main>");
+});